Adjustable bit.



G. `H'.' PAULUs. ADJUSTABLE BIT.

APPLIOATIONIILBD 311113,30, 190B.

Patented June 22, 1909.

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ADJUSTABLE BIT LPPLIOAIION FILED .Imm so, 190s.

l @www GEORGE H. PAULUS, OF STEUBENVILLE, OHIO.

ADJUSTABLE ABIT.l

Specification of Letters Patent.

Application filed June 30, 1908.

Patented `Tune 22,1909,

sei-iai No. 441,155.

To all 'whom 'it may concern:

Be it known that 1, GEORGE H. PAULUs, a citizen of the United States,residing at Steubenville, in the county of Jefferson and State of Ohio,have invented certain new and useful Improvements in iadjustable Bits,of which the following is a speci'cation.

This invention relates to augers or bits of the type embodying anadjustable cutter whereby the tool may be adjusted to facilitate boringof holes or openings of different sizes.

The essential feature of the invention resides in the eculiarconstruction of the tool, and especia y in the means employed for adjusting the cutter.

For a full understanding` of the invention, reference is to be had tothe following detail description and to the accompanying drawings, inwhich- Figure 1 is a side elevation of a tool embodying the invention;Fig. 2 is a vertical sectional view; Fig. 3 is a view similar to Fig. 2,the section being taken at a right angle thereto, however Fig. 4 is atransverse section on the line x-:c of Fig. 3; Fig. 5 is a section onthe line y-#y of Fig. 3, and Fig. 6 is a section on the line z--z ofFig. 3; Fig. 7 is a perspective view of the body of the bit; Fig. 8 is adetail view of the member separating the sleeves; Fig. 9 is a detailview of the wedge, and Fig. 10 is a side elevation of the adjustablecutter.

Throughout the following description and on the several figures of thedrawings similar parts are referred to by like reference characters.

Specifically describing the invention as illustrated in the drawings,the numeral 1 designates the shank of the tool and the numeral 2 thescrew point at its lower end usually employed for centering the auger orbit preparatory to operating the same in the well known manner. Mountedupon the lower portion of the shank 1 is a cutter 3 which is adjustabletransversely of the shank and being movable in guides 4. The upper'guide 4 is formed by a groove in the lower portion of a detachable plate5 while the lower guide has a similar groove in the lower end of theshank 1, the upper and lower edges of the cutter 3 being received in thegrooves as shown most clearly in the drawings.

The cutter 3 is provided with the usual cutting lip 6 and upon the innerside of said cutter are formed the teeth 7 which are provided atintervals nearly throughout the length of said cutter. The teeth 7 arein mesh with a pinion 8 on the lower end of a short shaft 9, the upperend of which is also provided with a pinion 10. The shaft?) is held inposition by means of the detachable late 5, said plate and the shank ofthe too having suitable bearings permitting of free rotation of theshaft, and the upper pinion 10 is in mesh with teeth 11 formed upon theinner side of a sleeve 12 rotatably mounted u on the lower portion ofthe shank 1. It wi l be apparent that upon rotation of the sleeve 12,the shaft 9 will be actuated and the pinion 8 coperating with the teeth7 will cause sliding movement of the adjustable cutter 3 in eitherdirection, according to the direction of rotation of the 'sleeve 12above referred to. The parts 8, 9, 10, and 12 are employed for actuatingthe adjustable cutter so as to vary the position of the cutter lip 6relative to the point 2 and thereby increase or decrease the cuttingradius of the tool in an obvious manner.

In order to hold the cutter 3 at a desired adjustment a wedge 13 isprovided, said wedge having a stem 14 at the upper end of which isformed a semi-circular head 15. The curved side of the head 15 is screwthreaded while the flat side thereof is arranged in contact with anadjacent flat side portion of the shank 1. Inclosing the head 15 of thewedge 13 is a second sleeve 16, which is internally screw threaded. Thethreads of the sleeve 16 engage those of the head 15 and the rotation ofthe sleeve will cause vertical or longitudinal movement of the head,similar movement being imparted to the wedge 13. The wedge 13 is formedwith an outwardly and downwardly inclined side, and said wedge isreceived in a seat 17 formed in the lower end portion of the tool at theinner side of the adjustable cutter 3. The inner wall of the seat 17 isinclined to conform with the inclination of the adjacent side of thewedge 13, and the lower end of said seat inclines upwardly and outwardlyas shown at 17a. rlhe outer side of the wedge 13 is formed with teeth13a and the inner side of the cutter 3 is provided with the teeth 7above described. The stem 14 of the wedge 13 extends upwardly throughthe sleeve 12 and into the space surrounded by the sleeve 16.

1t will be apparent that when it is desired to vary the cutting radiusofthe cutter 3 it is only necessary to rotate the sleeve 12 whichactuates the shaft 9 and pinion 8. When the cutting lip 6 of the cutter3 is suitably ad.- justed, the sleeve 16 is rotated so as to move theWedge 13 upwardly, whereby the inclined face of the wedge riding incontact with the inclined wall of the seat 17 forces the wedge outwardlycausing engagement of the teeth 13a with the teeth 7 of the cutter 3,the wedging coperation of the element 13 with the cutter 3 effectivelyholding the latter at the desired adjustment, the parts 3 and 13interlocking in an evident manner. To dis-v engage the wedge 13 from thecutter 3 the sleeve 16 is rotated in the opposite direction and thewedge forced downwardly, the lower end of said wedge moving in contactwith the lower end 17 a of the seat 17 and causing the wedge to moveonly slightly, but out of engagement with the cutter 3 so that thelatter may be freely adjusted.

Having thus described the invention, what is claimed as new, is:

1.. In an expansion auger, the combina-- tion of a shank, a cutterslidably mounted thereon and rovided with teeth, a pinion in mesh with te teeth of the cutter, a shaft carrying said pinion, a second pinionmount ed on the shaft, a sleeve mounted on the shank and having internalteeth meshing with the last mentioned pinion for rotation of the shaftto adjust the cutter, a Wedge mounted for longitudinal movement on theshank, a rotatable sleeve, and means connecting the last mentionedsleeve and wedge whereby the wedge may be moved into and out ofengagement with the cutter.

2. In an expansion auger, the combination of a shank, an adjustablecutter movably mounted on the shank, sleeves rotatably mounted on theshank, connecting means between one of the sleeves and the cutter foractuating the latter, and means operable by the other of the sleeves forholding the cutter at a predetermined adjustment.

3. rlhe combination of a shank, a cutter transversely slidable thereon,and havingY a cutting lip, sleeves rotatably mounted on the shank, ashaft, pinions connecting said shaft with one of the sleeves and withthe cutter, a longitudinally slidable wedge on the shank, a headconnected with said wedge and slidable in the other sleeve, said lastmentioned sleeve having a threaded connection with the head to actuatethe wedge and cause the same to engage with or disengage from thecutter.

In testimony whereof I aiiix my signature in presence of two witnesses.

GEORGE H. PAULUS.

Witnesses:

JOSEPH GREENBnR-G, CHAs. STEIN.

